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-rw-r--r--src/include/cpu/x86/tsc.h19
1 files changed, 16 insertions, 3 deletions
diff --git a/src/include/cpu/x86/tsc.h b/src/include/cpu/x86/tsc.h
index c57362755a..6ce7f5fc7d 100644
--- a/src/include/cpu/x86/tsc.h
+++ b/src/include/cpu/x86/tsc.h
@@ -1,6 +1,14 @@
#ifndef CPU_X86_TSC_H
#define CPU_X86_TSC_H
+#if CONFIG_TSC_SYNC_MFENCE
+#define TSC_SYNC "mfence\n"
+#elif CONFIG_TSC_SYNC_LFENCE
+#define TSC_SYNC "lfence\n"
+#else
+#define TSC_SYNC
+#endif
+
struct tsc_struct {
unsigned lo;
unsigned hi;
@@ -10,10 +18,11 @@ typedef struct tsc_struct tsc_t;
static inline tsc_t rdtsc(void)
{
tsc_t res;
- __asm__ __volatile__ (
+ asm volatile (
+ TSC_SYNC
"rdtsc"
: "=a" (res.lo), "=d"(res.hi) /* outputs */
- );
+ );
return res;
}
@@ -22,7 +31,11 @@ static inline tsc_t rdtsc(void)
static inline unsigned long long rdtscll(void)
{
unsigned long long val;
- asm volatile ("rdtsc" : "=A" (val));
+ asm volatile (
+ TSC_SYNC
+ "rdtsc"
+ : "=A" (val)
+ );
return val;
}
#endif